Patents by Inventor Robert E. Crossman

Robert E. Crossman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the conversion of molybdenite to molydenum oxide
    Patent number: 8753591
    Abstract: Molybdic oxide is recovered from molybdenite by a multistep process in which (A) the molybdenite is converted to soluble and insoluble molybdic oxide by pressure oxidation, (B) the insoluble molybdic oxide is converted to soluble molybdic oxide by alkaline digestion and then combined with the soluble molybdic oxide, and (C) the molybdenum values of the combined streams are extracted into an organic phase using a nonprimary amine. The extracted molybdenum values are recovered from the organic phase using aqueous ammonia to form ammonium dimolybdate (ADM) which is recovered as refined crystals from a two-step calcination process.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: June 17, 2014
    Assignee: Kennecott Utah Copper LLC
    Inventors: Mike Rockandel, Claus Stoiber, Robert E. Crossman
  • Process for the Conversion of Molybdenite to Molydenum Oxide
    Publication number: 20130251609
    Abstract: Molybdic oxide is recovered from molybdenite by a multistep process in which (A) the molybdenite is converted to soluble and insoluble molybdic oxide by pressure oxidation, (B) the insoluble molybdic oxide is converted to soluble molybdic oxide by alkaline digestion and then combined with the soluble molybdic oxide, and (C) the molybdenum values of the combined streams are extracted into an organic phase using a nonprimary amine. The extracted molybdenum values are recovered from the organic phase using aqueous ammonia to form ammonium dimolybdate (ADM) which is recovered as refined crystals from a two-step calcination process.
    Type: Application
    Filed: February 28, 2013
    Publication date: September 26, 2013
    Applicant: KENNECOTT UTAH COPPER LLC
    Inventors: Mike Rockandel, Claus Stoiber, Robert E. Crossman